1 Calibrating the Neogene of the Nordic Atlantic region Erik Anthonissen Ph.D. student, Natural History Museum, UiO.

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1 Calibrating the Neogene of the Nordic Atlantic region Erik Anthonissen Ph.D. student, Natural History Museum, UiO

NORLEX Neogene Lithostratigraphic Proposal Approx. age Central North Sea (UK sector) Northern North Sea (NO sector) Offshore Mid-Norway Barents Sea Pleistocene – Pliocene Naust Fm Pliocene – Miocene Kai Fm, Utsira Mbr Kai Fm, Molo Mbr Miocene – Oligocene Lark FmLark Fm, Skade Mbr Brygge Fm

Northern North Sea: Naust Formation Kai Formation with Utsira Member Lark Formation with Skade Member Offshore Mid-Norway: Naust Formation Kai Formation with Molo Member Brygge Formation

Naust S+T Naust U Naust A Naust N Kai/Molo Brygge Lithostratigraphic architecture of offshore Mid-Norway

Seismic section through the Utsira and Skade members (Rundberg & Eidvin, 2005)

Lithostratigraphic unitAge (Ma)Biostrat.CalibrationReference Nordland Group Naust Formation < 2.75 (Upper Pliocene- Pleistocene) FCO I.R.D, C. grossa Zone 2.75 Ma = Expansion of Scandinavian ice-sheet Jansen & Sjøholm (1991); Eidvin et al. (2006) Kai Formation Top = > 2.3 Base = ~ 9-12 G. bulloides Zone – B. fragori/subfrago ris Zone ODP Site 642: LCO G. bulloides = 2.3 Ma; LO Bfra = LO R. pseudoumbilicus = 8.71 Spiegler & Jansen (1989); Eldholm et al. (1985) Molo Member Top = > 2.3 Base = ~ 9 (Upper Miocene- Lower Pliocene) Uppermost N. atlantica (s) Zone - B. metzmacheri Zone LO NatS = 2.3 Ma (within C2r.2r in ODP Sites 981, 982, 644. LO Bmet = ~ 8 Ma (Site 982: just below FO D. surculus Flower (1998), Spiegler & Jansen (1989; Spiegler (1998) Utsira Member Top = 4.5 Base = 12 (Middle Miocene- Lower Pliocene) lower part of N. atlantica (s) Zone – top B. reticulata – badenensis Zone LO NatS = 2.3 Ma (within C2r.2r in ODP Sites 981, 982, dinocysts. Sr-isotopes: Ma Head et al. (2004); Piasecki et al. (2002); Rundberg & Eidvin (2005); Anthonissen (2003, unpub.) Westray Group Lark Formation Skade Member Top = 15.4 Base = 17 (Lower Miocene) Gr. ex. gr. praescitula- zealandica Zone LO Gp-z below LO S. heteromorphus = Ma (Site 982) + Sr-isotopes Rundberg & Eidvin (2005); Flower (1999) Hordaland Group Brygge FormationTop = ~18 (Lower Miocene) Base = Eoc. C. cantharellum Zone, LO C. cantharellum LO C. cantharellum = lower NN4 = Ma Powell (1992); Williams & Manum (1999)

Central and northern North Sea: Utsira and Skade members

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